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| 型号： | ATMEGA16A-MUR |
| 厂商： | Atmel |
| 文件页数： | 15/88页 |
| 文件大小： | 0K |
| 描述： | MCU AVR 16KB FLASH 16MHZ 44QFN |
| 产品培训模块： | megaAVR Introduction |
| 标准包装： | 4,000 |
| 系列： | AVR® ATmega |
| 核心处理器： | AVR |
| 芯体尺寸： | 8-位 |
| 速度： | 16MHz |
| 连通性： | I²C，SPI，UART/USART |
| 外围设备： | 欠压检测/复位，POR，PWM，WDT |
| 输入/输出数： | 32 |
| 程序存储器容量： | 16KB（8K x 16） |
| 程序存储器类型： | 闪存 |
| EEPROM 大小： | 512 x 8 |
| RAM 容量： | 1K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.7 V ~ 5.5 V |
| 数据转换器： | A/D 8x10b |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 44-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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PIC16F610/616/16HV610/616
DS41288F-page 114
2009 Microchip Technology Inc.
12.3.5
TIME-OUT SEQUENCE
On power-up, the time-out sequence is as follows:
PWRT time-out is invoked after POR has expired.
OST is activated after the PWRT time-out has
expired.
The total time-out will vary based on oscillator
configuration and PWRTE bit status. For example, in EC
mode with PWRTE bit erased (PWRT disabled), there
will be no time-out at all. Figure 12-4, Figure 12-5 and
Figure 12-6 depict time-out sequences.
Since the time-outs occur from the POR pulse, if MCLR
is kept low long enough, the time-outs will expire. Then,
bringing MCLR high will begin execution immediately
(see Figure 12-5). This is useful for testing purposes or
to
synchronize
more
than
one
PIC16F610/616/
16HV610/616 device operating in parallel.
Table 12-5 shows the Reset conditions for some
special registers, while Table 12-4 shows the Reset
conditions for all the registers.
12.3.6
POWER CONTROL (PCON)
REGISTER
The Power Control register PCON (address 8Eh) has
two Status bits to indicate what type of Reset occurred
last.
Bit 0 is BOR (Brown-out). BOR is unknown on Power-
on Reset. It must then be set by the user and checked
on subsequent Resets to see if BOR = 0, indicating that
a Brown-out has occurred. The BOR Status bit is a
“don’t care” and is not necessarily predictable if the
brown-out circuit is disabled (BOREN<1:0> = 00 in the
Configuration Word register).
Bit 1 is POR (Power-on Reset). It is a ‘0’ on Power-on
Reset and unaffected otherwise. The user must write a
‘1’ to this bit following a Power-on Reset. On a subse-
quent Reset, if POR is ‘0’, it will indicate that a Power-
on Reset has occurred (i.e., VDD may have gone too
low).
For more information, see Section 12.3.4 “Brown-out
TABLE 12-1:
TIME-OUT IN VARIOUS SITUATIONS
TABLE 12-2:
STATUS/PCON BITS AND THEIR SIGNIFICANCE
TABLE 12-3:
SUMMARY OF REGISTERS ASSOCIATED WITH BROWN-OUT RESET
Oscillator Configuration
Power-up
Brown-out Reset
Wake-up from
Sleep
PWRTE = 0
PWRTE = 1
PWRTE = 0
PWRTE = 1
XT, HS, LP
TPWRT + 1024
TOSC
1024 TOSC
TPWRT + 1024
TOSC
1024 TOSC
RC, EC, INTOSC
TPWRT
—TPWRT
——
POR
BOR
TO
PD
Condition
0x11
Power-on Reset
u011
Brown-out Reset
uu0u
WDT Reset
uu00
WDT Wake-up
uuuu
MCLR Reset during normal operation
uu10
MCLR Reset during Sleep
Legend: u = unchanged, x = unknown
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR, BOR
Value on
all other
Resets(1)
PCON
—
—POR
BOR
---- --qq
---- --uu
STATUS
IRP
RP1
RP0
TO
PD
Z
DC
C
0001 1xxx
000q quuu
Legend: u = unchanged, x = unknown, – = unimplemented bit, reads as ‘0’, q = value depends on condition.
Shaded cells are not used by BOR.
Note 1:
Other (non Power-up) Resets include MCLR Reset and Watchdog Timer Reset during normal operation.
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